Magnetic piston pump



Oct. 11, 1932. E. LEHRER 2 MAGNETIC PISTON PUMP v Filed April 25, 1931 2Sheets-Sheet 1 Fig.1.

INVENTOR Erwin Le7zre r BY 71115 ATTORNEYS Oct. 11, 1932. LEHRER1,881,724

r I MAGNETIC PISTON PUMP Filed April 25. 1931 2 Sheets-Sheet 2 Fig.2.

'INYENTOR BY 711 s ATTORNEYS Frwz'nLJa e-r Patented 0a. 11, 1932 UNITEDSTATES PATENT OFFICE ERWIN LEHRER, OI LUDWIGBHAFEN-ON-THE-RHINE,GERMANY, ASBIGNOR TO I. G- FARBENINDUBTZRIE AKTIENGESELLSOHAF'I, 0FFRANKFORT-ON-THE-MAIN, GER- MANY MAGNETIC PISTON PUMP Application filedApt-l1- 85, 1881, Berle! No. 582,748, and in Germany April 98, 1880.

The present invention relates to improvements in magnetically operatedpiston pumps.

Pumps for the movement of see and liquids are already known in which theistous consisting of a piece of iron are move backwards and forwardshorizontally by the attractive power of coils traversed by currents.

I have now found that the regulation of the ma net coils may beefl'ected simply and surely y an electromagnetically operated pendulumwith two contacts by which the coils are alternately connected to thesource of current. It is especially 'advanta cons to arran e the twocontacts in an annu ar tube in winch there is mercury which effects theclosure of the circuit by the movement of the pendulum. Other forms ofcontact may of course be employed instead of an annular tube, as forexample two separate contacts which the pendulum strikes.

In order'to reduce the great friction produced by the horizontally movedpiston and which must be overcome by the magnetic attraction, it ispreferable to arrange the piston in a vertical cylinder and to take theload thereof, for example with a spring. In this manner the friction ofthe piston is reduced to a minimum'and the efliciency of the pump isconsiderably/improved.

Instead of metallic pistons, a column of liquid in a -U-tube may beemployed as the piston, the liquid being set in-oscillation, by means ofone or two ferromagnetic cores floating on one or both legsof theliquid, the cores being operated by one or two electroma neticcoil'.

apecial advantage in the employment of liqui columns instead 'ofmetallic pistons consists particularl in the completely pressure-tightclosure 0 tained without appreci able increase in the loss caused byfriction. It is therefore possible with such pumps to move equal volumesof different gases at the same time. When only one gas is to be moved,the suction andoutlet openings of the valge member are preferably joinedtoget er. A I

It is preferable to excite the coils in correspondence with thefrequency of the oscillations of the column of liquid because theefficiency of the pump is thus increased.

The nature of the invention will be further described withreference tothe accompanying drawings which illustrate, diagrammatica ly and partlyin section, arrangements of apparatus according to this invention, butthe invention is not restricted to these arrangements.

Iugure 1 is a vertical section throu h a pump having a reversing devicewhic is actuated b a endulum operated electroma ncticali y. 1 i ures 2and 3 illustrate mo ifications of t e ump in vertical section, cachpiston of tiese pumps being relaced by a liquid on which float one ortwo erromagnetic cores.

Referring to Figure 1, a ferromagnetic piston c WillCl is readilymovable but without play is suspended on a spring (1 in a verticalcylinder a havin a lateral joint 6." Two windings e and i as for exampletwo copper wire coils, are wound round the cylinder a. They arealternately joined to a source of current by a commutator U. The iston cis thus moved up and down, the liqui or gas to be moved beim sucked inthrough the lower valves of the valve member 9 and forced out throughthe upper valves. The commutator U which serves for regulating themagnet coils c and f is constructed as an annular tube at having amercury filling by which the contacts or 0 are joined to n according tothe position of the pendulum h.

The )e'ndulum it, having a movable pendulum ody i is operatedelectromagnetically by means of the coil 1 by which an iron body inconsisting of strips of sheet iron is attracted. The connections of thecoil 1 to the commutator U will. be seen from the drawin s.

n order to obtain a uniform and quiet operation of the pump and stillfurther to improve its eiiiciency it is advantageous to adjust theoscillations of the endulum to the peculiar oscillation of thepiston-spring system by movin the pendulum body a.

oreover, 1t is preferable to prepare the iston c-not from a massivepiece of iron but mm a tube filled with strips of sheet iron because thepump may then be actuated by ployed, which necessitated either aransformer aggregate or the presence of a batterv of accumulators. v

eferring to Figure 2, which illustrates a pump in which the piston is relaced by a column of liquid, a liquid 0, as or example mercury oranother iquid having a very high specific gravit and a low vapor tensionis. laced in a U-tu e p. On one arm of the co inn of liquid floats aniron core q. Two coils f and e are wound round this and are providedwith three contacts 1, 2 and 8. The contacts 1 and 2 are connected .witha commutator as shown in Figure 1 which alternately connects the coilswith a sourcepf current. The contact 3 is connected directly to one oleof the source of current. The upper en s of the U-tube p are closed bythe valve members 1' and a through which the mamas my hand.

I ERWIN LEHRER.

material to be moved is sucked in at the bot- 7 m and forced out at' thetop by the movement of the column of liquid.

Referring to Figure .3, which illustrates a modification of the ampshown in Figure2, iron cores t and u oat on both arms of the column ofliquid 0. The arms of the U-tube each have a coil 6 and f havingcontacts 4, 5 and 6 which are connected as described in regard to Figure2. The'method of opera tion is similar to that described with referenceto Figure 2.

In the appended'claims the term ferromagnetic piston" is used to includeboth the metallic form of piston hereinbetore referred to as well asaliquid serving as the piston and bearing one or more magnetic floats.

What I claim is:

1. In a fluid pump, in combination a vertical cylinder, a ferromagneticpiston in said cylinder, at, least one cell on said cylinder adapted toeriodicall act on said piston, and a; pendu um provi ed with currentleads and contacts, thereby periodically connecting said coil to asource at current.

9. An arran ment as claimed in claim 1 in I which, two co s arealtetrnately connects to said sou ren '8. arrangement as claimed!!!claim 1 in which two cells are provided and these are of cur alternatelyconnected to said source of our-- rent and in which the pendulum isprovided with an annular tube containing three contacts and being partlyfilled with mercury so u t that the mercur makesan electric mm betweentwo of he said three contacts alter- .ylinder, a ferronia natel onoscillation of the pendulum.

4- n a. pump, in combination a vertical etic piston in said cyliner, aspring m sea 0 linder taking the load of said piston, at leas one d'eradapted to periodically act on said pisrovided and base are coil on saideylln-

